GA4 Tracking Plan Limits: test results

Verdicts

Date

2026-10-19

Strong · claude-sonnet-5-5 (Claude Code alias "sonnet")

Right on all 3 cases, read by hand. On the shop plan it named the event of 43 characters with the count and left out the parameter name of exactly 40. On the help-centre plan it gave the reserved event name and the order number held in a user-scoped dimension, and left out the event with exactly 25 parameters. On the clean billing plan, with an event name of exactly 40 characters, it answered exactly No findings.

Weak · claude-haiku-5-5 (Claude Code alias "haiku")

Right on all 3 cases, read by hand. It gave the same single line for the long event name, the two expected lines for the help-centre plan, and exactly No findings for the clean plan, including the 40-character event name. Its suggested shorter names were its own and were counted correctly.

Note

Light test: three cases (two planted, one clean), one run per model; no comparison without the skill. The three inputs were written by us; each planted one carries a safe look-alike and neither has a comment pointing at the defect. Facts come from the public pages named in the notes, read on 19 October 2026; there are no owner-measured facts.

What was not measured

• Models other than the two named above were not run.
• Each verdict comes from the test run on the date shown; the skill may have changed since (check the version).
• Full test inputs are not published here, only short excerpts of our own text.
• Results on your own texts, languages and domains can differ.